Historically, Pennington formed part of the
Hundred of
West Derby, a judicial division of southwest Lancashire. It was one of six townships or vills that made up the ancient
ecclesiastical parish of Leigh. Pennington was also a
chapelry. The townships existed before the parish. Under the terms of the
Poor Law Amendment Act 1834 the townships formed part of the Leigh
Poor Law Union which was established on 26 January 1837 comprising an area covering the whole of the parish of Leigh and part of Winwick. The
workhouses in Pennington, Culcheth, Tyldesley, and Lowton, but they were replaced by
Leigh Union workhouse at Atherleigh in the 1850s. The Local Government Act, 1858, was adopted by the township in 1863 and Pennington Local Board of Health was established. In 1866, the legal definition of 'parish' was changed to be the areas used for administering the poor laws, and so Pennington became a civil parish. In 1875 it became part of that of Leigh Local Board of Health. and became part of Leigh
Urban District ==Geography==